R1230D Datasheet, PDF (7/20 Pages) RICOH electronics devices division – PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

s TEST CIRCUITS
VIN
V_DD
Lx
CE
AGND V_OUT
A
PGND MODE
Test Circuit for Input Current and Leakage Current
VIN
Lx
V_DD
CE
VOUT
AGND
PGND ^MODE
OSCILLOSCOPE
Test Circuit for Input Voltage and UVLO voltage
VIN
Lx
V_DD
CE
V
OUT
AGND
PGND MODE
OSCILLOSCOPE
L
V OUT
10uF
Test Circuit for Output Voltage, Oscillator Frequency, Soft-Starting Time
VIN
Lx
A
V_DD
CE
AGND ^VOUT
PGND MODE
V
IN
V_DD
Lx
CE
VOUT
AGND
PGND MODE
OSCILLOSCOPE
A
Test Circuit for Supply Current and Standby Current
Test Circuit for ON resistance of Lx, Limit Voltage, Delay
Time of Protection Circuit
The bypass capacitor between Power Supply and GND is Ceramic capacitor 10µF.
Rev. 1.12
-7-